In which of the following cloud models is the customer not responsible for hardware and OS layers but is responsible for the data and the application?

Platform as a Service (PaaS) provides a complete development and deployment environment in the cloud, where the cloud provider manages the operating system, virtualization, servers, storage, and networking. The customer is responsible for managing the applications they deploy onto the platform and the data within those applications.

In Software as a Service (SaaS), the cloud provider manages the entire application stack, including the application, data, runtime, OS, and hardware; the customer only uses the application.

In Infrastructure as a Service (IaaS), the cloud provider manages the hardware, networking, virtualization, and storage, but the customer is responsible for managing the operating system, applications, and data.

CaaS (Container as a Service) is a specific type of PaaS or IaaS that focuses on container orchestration but is not a primary cloud service model that defines responsibilities at the OS level as broadly as PaaS.